Java Class Library's usage guidelines for the use of Android dependence on libraries
In Android development, dependent injection (DI) is a popular design model that helps reduce the coupling of code and improve maintainability.In order to simplify the process of relying on injection, many developers use dependence to inject libraries.This article will introduce how to use Android dependencies into the library in the Java library and provide some Java code examples.
The first step is to introduce proper dependencies in the project in the project.In Android development, Dagger and Butterknife are the two most commonly used dependent injection libraries.We need to add corresponding dependencies to the project's Build.gradle file.
implementation 'com.google.dagger:dagger:2.x' // Dagger
implementation 'com.jakewharton:butterknife:10.x.x' // ButterKnife
The second step is to configure the Application class of the application to use the dependencies into the library.Generally, we need to create a custom Application class, and then initialize the dependencies in the injection library.
public class MyApp extends Application {
@Override
public void onCreate() {
super.onCreate();
initializeDependencyInjection();
}
private void initializeDependencyInjection() {
// Initialize Dagger
AppComponent appComponent = DaggerAppComponent.create();
// Initialize Butterknife
ButterKnife.setDebug(true);
ButterKnife.bind(this);
}
}
In the above example, we use Dagger to create an AppComponent instance and use Butterknife to bind the Application object.Make sure the custom Applicative class is registered in the AndroidManifest.xml file.
The third step is to annotate the dependencies in the class that needs to be injected.For Dagger, we can use the field or constructor that the @Inject annotation mark needs to be injected.
public class UserRepository {
@Inject
public UserRepository() {
// Construct function injection
}
}
For Butterknife, we use the @BindView annotation marker field to be injected, and call the Butterknife.bind () in the initialization method.
public class MainActivity extends AppCompatActivity {
@BindView(R.id.textView)
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
// Use TextView for operation
}
}
In the above example, we used @inject annotations to mark the constructor of the UserRePOSITORY class, so that it can be relying by Dagger for injecting.In MainActivity, we use the @BindView annotation to mark the TextView field, and call the Butterknife.bind () in the onCreate method for viewing.
It should be noted that when using Dagger for dependent injection, we also need to create the corresponding Component interface and the Module class to provide the need to inject the need to be injected.
Relying injection is a powerful and flexible technology that can help us write scalable and test -available codes.By using the appropriate dependency injection library, we can easily achieve dependent injection in the Java class library.It is hoped that this article provides some guidance help for understanding the use of Android dependencies.
